On Tue, Jul 07, 2009 at 12:15:46AM +0400, Marat N.Afanasyev wrote: > Kostik Belousov wrote: > >On Mon, Jul 06, 2009 at 09:45:45PM +0400, Marat N.Afanasyev wrote: > >>i have a huge amount of small files on the source systems, as you can > >>see they have about 20 million files and almost each of them is jpeg or > >>gif. afaik, there are no sparse files at all. > >> > >>i still cannot figure out what is it: a free space leak in ufs2+su or > >>bug in statfs(3), that is used in df, or something else. > > > >My guess that it is due to fragmentation. > >As an experiment, try to create 1-byte file. Does it work on the filesystem > >in described state ? > > I can create small files, as many as i have patience, maximum size of > such "small file" is 14336, so. it seems that if file is no greater than > (block_size-2048) it can be created. larger file cannot be created. > > imho, fragmentation on filesystem should be very low, there were no > deletions on it, just creations.
The fragmentation on UFS usually means using fragments for the file tails, not having file sequential blocks allocated in the non-sequential disk blocks. You experiment confirms my hypothesis.
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